An enhancing mechanism to be placed primarily below the neutral axis of a girder is presented. Each lateral wall has a front edge adjoining the front wall, a back edge spaced from the front edge, and upright ribs extending in-wardly outwardly from the lateral wall. Very dense dark green semi-glossy foliage is formed that contrasts nicely with the blossom coloration. The keyboard module includes a supporting member, a keyboard assembly, and a flexible circuit board electrically connected with the printed circuit board. The core has its inside face at least center portion of which is spaced radially from the thermal conductor by a predetermined distance.